Patent GB-230005-A (GB)
Title: Improvements in machines for making spiral wire fabrics
IPC: B21F27/04
Filed: 1924-09-04
Abstract: 230,005. Brandl, H. Feb. 25, 1924, [Convention date]. Coiling; shearing- adjuncts. - In a machine for making coiled wire fabrics of the type in which the wire is coiled and threaded by a rotary forward movement into a previously inserted coil and is then cut off at the rear end of the fabric and a relative axial movement then given between the coil just inserted and the end to be inserted next in order to facilitate insertion of the next coil, the wire on its way to the coiler passes over and drives by friction a roller acting on a control mechanism which, when a coil has been inserted, throws out the coiling mechanism and inserts the cutting mechanism and the mechanism for effecting the relative axial movement, whereupon the coiling mechanism is again automatically engaged and the cutter put out of action. The helically grooved coiling spindle 3, which rotates in a cylindrical shell and is carried by a slide 23, is connected by a dog clutch 4 to the movable member 5 of an electromagnetic clutch 6 secured to the continuously driven main shaft 8. The cutter 17 and the slide 23 are operated by cams 19, 20 on a shaft 14, which is driven by worm gear 13, 12, 11, from the movable member 10 of a second electromagnetic clutch 7 integral with the clutch 6. The wire is drawn through rollers so as to rotate the roller 33 and so by worm and spur gear to rotate a drum 37 provided with a contact ring 41 and a contact segment 42 connected thereto. The shaft 14 carries a contact drum 38 with electrically connected contact segments 44, ring 43 and gapped ring 45, the segments being slightly longer than the gaps, and the clutch members 6, 7 have secured thereto a drum 39 with electrically connected contact rings 46, 47, 48. When the machine is started one segment 44 is touching its sliding contact and the clutch 6 is energized by way of wire 49, rings 47, 48, wire 54, segment 44, ring 43 and wire 50. The coiling shaft 3 is thus rotated, the wire also rotating the drum 37. When during rotation of the drum 37 the segment 42 engages its sliding contact a circuit is completed through 49, 47, 46, 53, 52, 41, 42, 51, 50 and the clutch 7 is energized so that the shaft 14 is set in motion. By the consequent rotation of the drum 38, the segment 44 is put out of action and the clutch 6 de-energized so stopping the rotation of the shaft 3. The drum 37 stops with its contact 42 out of action, the circuit being completed through 49, 47, 46, 53, rings 45, 43 and wire 50. When, during rotation of the drum 38 one of the gaps in the ring 45 is opposite its contact, the current to clutch 7 is cut off thus stopping the shaft 14. At this time, however, one of the segments 44 is again in operation and the coiling shaft again starts to rotate. The cutter is normally held in raised position by one of the cams 19 and is pressed down by a spring 16 at the desired moment to perform the cutting operation. The cams 19 are also arranged to engage the arm 24 of a spring- pressed slotted lever 25, which through a pin 27 operates a spring clip 20. This clip encloses the end of the coil last inserted and so pulls it laterally away from the cut end of the coil next to be inserted, so preventing locking of the cut ends when the slide 23 is moved. The clip then moves to the rear of the end of this coil and then moves forward again so malting a complete reciprocation during each cycle of operations, whereas the slide moves forward during one cycle and backwards during the next cycle. The completed fabric is fed by rollers 32. The electrical control of the drive may be replaced by mechanical control.